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ARM i.MX53: notify clocksource about changing clock

PATCH In review Wjatscheslaw Stoljarski (Slawa) 2 participants 2 messages Jul 24, 2012 – Jul 25, 2012

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Arm (32-bit) Arm sub-architectures Arm i.MX and Layerscape
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Wjatscheslaw Stoljarski (Slawa)

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#0 lore raw

PATCH 1/1 ARM i.MX53: notify clocksource about changing clock

This fix a clock inaccuracy in get_time_ns (used by sleep, time, etc).

At i.MX53 power-on GPT clock is typically 55500000 Hz, and it will be used to calc the clock multiplier. After call imx53_init_lowlevel() GPT clock will changed (e.g. to 66666666 Hz), but multiplier not. To fix this behavior call clock_notifier_call_chain() after changing clock in imx53_init_lowlevel().

Signed-off-by Wjatscheslaw Stoljarski <[email protected]>
---
 arch/arm/mach-imx/imx53.c |    3 +++
 1 file changed, 3 insertions(+)
arch/arm/mach-imx/imx53.c +3 -0
index e20b60a..3359819 100644
@@ -18,6 +18,7 @@
 #include <init.h>
 #include <common.h>
 #include <io.h>
+#include <notifier.h>
 #include <sizes.h>
 #include <mach/imx5.h>
 #include <mach/imx-regs.h>

@@ -211,4 +212,6 @@ void imx53_init_lowlevel(unsigned int cpufreq_mhz)
 	writel(0xffffffff, ccm + MX53_CCM_CCGR7);
  	writel(0, ccm + MX5_CCM_CCDR);
+
+	clock_notifier_call_chain();
 }
Signature · 7 lines
1.7.9.5


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#1 lore raw
Quoted 10 lines · Wjatscheslaw Stoljarski (Slawa)

This fix a clock inaccuracy in get_time_ns (used by sleep, time, etc).

At i.MX53 power-on GPT clock is typically 55500000 Hz, and it will be used to calc the clock multiplier. After call imx53_init_lowlevel() GPT clock will
changed (e.g. to 66666666 Hz), but multiplier not. To fix this behavior call clock_notifier_call_chain() after changing clock in imx53_init_lowlevel().

Signed-off-by: Wjatscheslaw Stoljarski
<[email protected]>

Your patch has some formatting problems, for example the line above is broken into two. Please consider using git send-email next time.

Applied manually. Thanks

Sascha

Quoted 31 lines
---
 arch/arm/mach-imx/imx53.c |    3 +++
 1 file changed, 3 insertions(+)
arch/arm/mach-imx/imx53.c +3 -0
index e20b60a..3359819 100644
@@ -18,6 +18,7 @@
 #include <init.h>
 #include <common.h>
 #include <io.h>
+#include <notifier.h>
 #include <sizes.h>
 #include <mach/imx5.h>
 #include <mach/imx-regs.h>

@@ -211,4 +212,6 @@ void imx53_init_lowlevel(unsigned int cpufreq_mhz)
 	writel(0xffffffff, ccm + MX53_CCM_CCGR7);
  	writel(0, ccm + MX5_CCM_CCDR);
+
+	clock_notifier_call_chain();
 }
Signature · 7 lines
1.7.9.5


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